Regularized maximum likelihood linear regression adaptation for computer-assisted language learning systems

	Regularized maximum likelihood linear regression adaptation for computer-assisted language learning systems
	Dean LUO; Yu QIAO; Nobuaki MINEMATSU; Keikichi HIROSE
刊名	IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS
	2011
卷号	94 期号:2 页码:308-316
英文摘要	This study focuses on speaker adaptation techniques for Computer-Assisted Language Learning (CALL). We first investigate the effects and problems ofMaximum Likelihood Linear Regression (MLLR) speaker adaptation when used in pronunciation evaluation. Automatic scoring and error detection experiments are conducted on two publicly available databases of Japanese learners' English pronunciation. As we expected, over-adaptation causes misjudgment of pronunciation accuracy. Following the analysis, we propose a novel method, Regularized Maximum Likelihood Regression (Regularized-MLLR) adaptation, to solve the problem of the adverse effects of MLLR adaptation. This method uses a group of teachers' data to regularize learners' transformation matrices so that erroneous pronunciations will not be erroneously transformed as correct ones. We implement this idea in two ways: one is using the average of the teachers' transformation matrices as a constraint to MLLR, and the other is using linear combinations of the teachers' matrices to represent learners' transformations. Experimental results show that the proposed methods can better utilize MLLR adaptation and avoid over-adaptation.
收录类别	SCI
原文出处	http://search.ieice.org/bin/summary.php?id=e94-d_2_308
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/3173]
专题	深圳先进技术研究院_集成所
作者单位	IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS
推荐引用方式 GB/T 7714	Dean LUO,Yu QIAO,Nobuaki MINEMATSU,et al. Regularized maximum likelihood linear regression adaptation for computer-assisted language learning systems[J]. IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS,2011,94(2):308-316.
APA	Dean LUO,Yu QIAO,Nobuaki MINEMATSU,&Keikichi HIROSE.(2011).Regularized maximum likelihood linear regression adaptation for computer-assisted language learning systems.IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS,94(2),308-316.
MLA	Dean LUO,et al."Regularized maximum likelihood linear regression adaptation for computer-assisted language learning systems".IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 94.2(2011):308-316.